21807940

素因数分解:

$2^2\times 5^1\times 7^3\times {\mathrm{11}}^1\times {\mathrm{17}}^2$

素因数の和:75

約数の個数: 144

約数和(自身を含む): 61891200

約数和(自身を除く): 40083260

約数列:

[1, 2, 4, 5, 7, 10, 11, 14, 17, 20, 22, 28, 34, 35, 44, 49, 55, 68, 70, 77, 85, 98, 110, 119, 140, 154, 170, 187, 196, 220, 238, 245, 289, 308, 340, 343, 374, 385, 476, 490, 539, 578, 595, 686, 748, 770, 833, 935, 980, 1078, 1156, 1190, 1309, 1372, 1445, 1540, 1666, 1715, 1870, 2023, 2156, 2380, 2618, 2695, 2890, 3179, 3332, 3430, 3740, 3773, 4046, 4165, 5236, 5390, 5780, 5831, 6358, 6545, 6860, 7546, 8092, 8330, 9163, 10115, 10780, 11662, 12716, 13090, 14161, 15092, 15895, 16660, 18326, 18865, 20230, 22253, 23324, 26180, 28322, 29155, 31790, 36652, 37730, 40460, 44506, 45815, 56644, 58310, 63580, 64141, 70805, 75460, 89012, 91630, 99127, 111265, 116620, 128282, 141610, 155771, 183260, 198254, 222530, 256564, 283220, 311542, 320705, 396508, 445060, 495635, 623084, 641410, 778855, 991270, 1090397, 1282820, 1557710, 1982540, 2180794, 3115420, 4361588, 5451985, 10903970, 21807940]

約数ペア:

[(1, 21807940), (2, 10903970), (4, 5451985), (5, 4361588), (7, 3115420), (10, 2180794), (11, 1982540), (14, 1557710), (17, 1282820), (20, 1090397), (22, 991270), (28, 778855), (34, 641410), (35, 623084), (44, 495635), (49, 445060), (55, 396508), (68, 320705), (70, 311542), (77, 283220), (85, 256564), (98, 222530), (110, 198254), (119, 183260), (140, 155771), (154, 141610), (170, 128282), (187, 116620), (196, 111265), (220, 99127), (238, 91630), (245, 89012), (289, 75460), (308, 70805), (340, 64141), (343, 63580), (374, 58310), (385, 56644), (476, 45815), (490, 44506), (539, 40460), (578, 37730), (595, 36652), (686, 31790), (748, 29155), (770, 28322), (833, 26180), (935, 23324), (980, 22253), (1078, 20230), (1156, 18865), (1190, 18326), (1309, 16660), (1372, 15895), (1445, 15092), (1540, 14161), (1666, 13090), (1715, 12716), (1870, 11662), (2023, 10780), (2156, 10115), (2380, 9163), (2618, 8330), (2695, 8092), (2890, 7546), (3179, 6860), (3332, 6545), (3430, 6358), (3740, 5831), (3773, 5780), (4046, 5390), (4165, 5236)]